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<title>Cookie (Tomcat API Documentation)</title>
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<div class="header">
<div class="subTitle">javax.servlet.http</div>
<h2 title="Class Cookie" class="title">Class Cookie</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>javax.servlet.http.Cookie</li>
</ul>
</li>
</ul>
<div class="description">
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<dt>All Implemented Interfaces:</dt>
<dd>java.lang.Cloneable</dd>
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<br>
<pre>public class <span class="strong">Cookie</span>
extends java.lang.Object
implements java.lang.Cloneable</pre>
<div class="block">Creates a cookie, a small amount of information sent by a servlet to
a Web browser, saved by the browser, and later sent back to the server.
A cookie's value can uniquely
identify a client, so cookies are commonly used for session management.
<p>A cookie has a name, a single value, and optional attributes
such as a comment, path and domain qualifiers, a maximum age, and a
version number. Some Web browsers have bugs in how they handle the
optional attributes, so use them sparingly to improve the interoperability
of your servlets.
<p>The servlet sends cookies to the browser by using the
<a href="../../../javax/servlet/http/HttpServletResponse.html#addCookie(javax.servlet.http.Cookie)"><code>HttpServletResponse.addCookie(javax.servlet.http.Cookie)</code></a> method, which adds
fields to HTTP response headers to send cookies to the
browser, one at a time. The browser is expected to
support 20 cookies for each Web server, 300 cookies total, and
may limit cookie size to 4 KB each.
<p>The browser returns cookies to the servlet by adding
fields to HTTP request headers. Cookies can be retrieved
from a request by using the <a href="../../../javax/servlet/http/HttpServletRequest.html#getCookies()"><code>HttpServletRequest.getCookies()</code></a> method.
Several cookies might have the same name but different path attributes.
<p>Cookies affect the caching of the Web pages that use them.
HTTP 1.0 does not cache pages that use cookies created with
this class. This class does not support the cache control
defined with HTTP 1.1.
<p>This class supports both the Version 0 (by Netscape) and Version 1
(by RFC 2109) cookie specifications. By default, cookies are
created using Version 0 to ensure the best interoperability.</div>
<dl><dt><span class="strong">Author:</span></dt>
<dd>Various</dd></dl>
</li>
</ul>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../javax/servlet/http/Cookie.html#Cookie(java.lang.String,%20java.lang.String)">Cookie</a></strong>(java.lang.String name,
java.lang.String value)</code>
<div class="block">Constructs a cookie with a specified name and value.</div>
</td>
</tr>
</table>
</li>
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<h3>Method Summary</h3>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#clone()">clone</a></strong>()</code>
<div class="block">Overrides the standard <code>java.lang.Object.clone</code>
method to return a copy of this cookie.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#getComment()">getComment</a></strong>()</code>
<div class="block">Returns the comment describing the purpose of this cookie, or
<code>null</code> if the cookie has no comment.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#getDomain()">getDomain</a></strong>()</code>
<div class="block">Returns the domain name set for this cookie.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#getMaxAge()">getMaxAge</a></strong>()</code>
<div class="block">Returns the maximum age of the cookie, specified in seconds,
By default, <code>-1</code> indicating the cookie will persist
until browser shutdown.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#getName()">getName</a></strong>()</code>
<div class="block">Returns the name of the cookie.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#getPath()">getPath</a></strong>()</code>
<div class="block">Returns the path on the server
to which the browser returns this cookie.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#getSecure()">getSecure</a></strong>()</code>
<div class="block">Returns <code>true</code> if the browser is sending cookies
only over a secure protocol, or <code>false</code> if the
browser can send cookies using any protocol.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#getValue()">getValue</a></strong>()</code>
<div class="block">Returns the value of the cookie.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#getVersion()">getVersion</a></strong>()</code>
<div class="block">Returns the version of the protocol this cookie complies
with.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#setComment(java.lang.String)">setComment</a></strong>(java.lang.String purpose)</code>
<div class="block">Specifies a comment that describes a cookie's purpose.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#setDomain(java.lang.String)">setDomain</a></strong>(java.lang.String pattern)</code>
<div class="block">Specifies the domain within which this cookie should be presented.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#setMaxAge(int)">setMaxAge</a></strong>(int expiry)</code>
<div class="block">Sets the maximum age of the cookie in seconds.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#setPath(java.lang.String)">setPath</a></strong>(java.lang.String uri)</code>
<div class="block">Specifies a path for the cookie
to which the client should return the cookie.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#setSecure(boolean)">setSecure</a></strong>(boolean flag)</code>
<div class="block">Indicates to the browser whether the cookie should only be sent
using a secure protocol, such as HTTPS or SSL.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#setValue(java.lang.String)">setValue</a></strong>(java.lang.String newValue)</code>
<div class="block">Assigns a new value to a cookie after the cookie is created.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/Cookie.html#setVersion(int)">setVersion</a></strong>(int v)</code>
<div class="block">Sets the version of the cookie protocol this cookie complies
with.</div>
</td>
</tr>
</table>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
</ul>
</li>
</ul>
</li>
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<h3>Constructor Detail</h3>
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<h4>Cookie</h4>
<pre>public Cookie(java.lang.String name,
java.lang.String value)</pre>
<div class="block">Constructs a cookie with a specified name and value.
<p>The name must conform to RFC 2109. That means it can contain
only ASCII alphanumeric characters and cannot contain commas,
semicolons, or white space or begin with a $ character. The cookie's
name cannot be changed after creation.
<p>The value can be anything the server chooses to send. Its
value is probably of interest only to the server. The cookie's
value can be changed after creation with the
<code>setValue</code> method.
<p>By default, cookies are created according to the Netscape
cookie specification. The version can be changed with the
<code>setVersion</code> method.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - a <code>String</code> specifying the name of the cookie</dd><dd><code>value</code> - a <code>String</code> specifying the value of the cookie</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if the cookie name contains illegal characters
(for example, a comma, space, or semicolon)
or it is one of the tokens reserved for use
by the cookie protocol</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#setValue(java.lang.String)"><code>setValue(java.lang.String)</code></a>,
<a href="../../../javax/servlet/http/Cookie.html#setVersion(int)"><code>setVersion(int)</code></a></dd></dl>
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<h4>setComment</h4>
<pre>public void setComment(java.lang.String purpose)</pre>
<div class="block">Specifies a comment that describes a cookie's purpose.
The comment is useful if the browser presents the cookie
to the user. Comments
are not supported by Netscape Version 0 cookies.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>purpose</code> - a <code>String</code> specifying the comment
to display to the user</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#getComment()"><code>getComment()</code></a></dd></dl>
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<a name="getComment()">
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<h4>getComment</h4>
<pre>public java.lang.String getComment()</pre>
<div class="block">Returns the comment describing the purpose of this cookie, or
<code>null</code> if the cookie has no comment.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> containing the comment,
or <code>null</code> if none</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#setComment(java.lang.String)"><code>setComment(java.lang.String)</code></a></dd></dl>
</li>
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<a name="setDomain(java.lang.String)">
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<h4>setDomain</h4>
<pre>public void setDomain(java.lang.String pattern)</pre>
<div class="block">Specifies the domain within which this cookie should be presented.
<p>The form of the domain name is specified by RFC 2109. A domain
name begins with a dot (<code>.foo.com</code>) and means that
the cookie is visible to servers in a specified Domain Name System
(DNS) zone (for example, <code>www.foo.com</code>, but not
<code>a.b.foo.com</code>). By default, cookies are only returned
to the server that sent them.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>pattern</code> - a <code>String</code> containing the domain name
within which this cookie is visible;
form is according to RFC 2109</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#getDomain()"><code>getDomain()</code></a></dd></dl>
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<h4>getDomain</h4>
<pre>public java.lang.String getDomain()</pre>
<div class="block">Returns the domain name set for this cookie. The form of
the domain name is set by RFC 2109.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> containing the domain name</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#setDomain(java.lang.String)"><code>setDomain(java.lang.String)</code></a></dd></dl>
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<h4>setMaxAge</h4>
<pre>public void setMaxAge(int expiry)</pre>
<div class="block">Sets the maximum age of the cookie in seconds.
<p>A positive value indicates that the cookie will expire
after that many seconds have passed. Note that the value is
the <i>maximum</i> age when the cookie will expire, not the cookie's
current age.
<p>A negative value means
that the cookie is not stored persistently and will be deleted
when the Web browser exits. A zero value causes the cookie
to be deleted.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>expiry</code> - an integer specifying the maximum age of the
cookie in seconds; if negative, means
the cookie is not stored; if zero, deletes
the cookie</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#getMaxAge()"><code>getMaxAge()</code></a></dd></dl>
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<h4>getMaxAge</h4>
<pre>public int getMaxAge()</pre>
<div class="block">Returns the maximum age of the cookie, specified in seconds,
By default, <code>-1</code> indicating the cookie will persist
until browser shutdown.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>an integer specifying the maximum age of the
cookie in seconds; if negative, means
the cookie persists until browser shutdown</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#setMaxAge(int)"><code>setMaxAge(int)</code></a></dd></dl>
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<h4>setPath</h4>
<pre>public void setPath(java.lang.String uri)</pre>
<div class="block">Specifies a path for the cookie
to which the client should return the cookie.
<p>The cookie is visible to all the pages in the directory
you specify, and all the pages in that directory's subdirectories.
A cookie's path must include the servlet that set the cookie,
for example, <i>/catalog</i>, which makes the cookie
visible to all directories on the server under <i>/catalog</i>.
<p>Consult RFC 2109 (available on the Internet) for more
information on setting path names for cookies.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>uri</code> - a <code>String</code> specifying a path</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#getPath()"><code>getPath()</code></a></dd></dl>
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<h4>getPath</h4>
<pre>public java.lang.String getPath()</pre>
<div class="block">Returns the path on the server
to which the browser returns this cookie. The
cookie is visible to all subpaths on the server.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> specifying a path that contains
a servlet name, for example, <i>/catalog</i></dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#setPath(java.lang.String)"><code>setPath(java.lang.String)</code></a></dd></dl>
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<h4>setSecure</h4>
<pre>public void setSecure(boolean flag)</pre>
<div class="block">Indicates to the browser whether the cookie should only be sent
using a secure protocol, such as HTTPS or SSL.
<p>The default value is <code>false</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>flag</code> - if <code>true</code>, sends the cookie from the browser
to the server only when using a secure protocol;
if <code>false</code>, sent on any protocol</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#getSecure()"><code>getSecure()</code></a></dd></dl>
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<h4>getSecure</h4>
<pre>public boolean getSecure()</pre>
<div class="block">Returns <code>true</code> if the browser is sending cookies
only over a secure protocol, or <code>false</code> if the
browser can send cookies using any protocol.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the browser uses a secure protocol;
otherwise, <code>true</code></dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#setSecure(boolean)"><code>setSecure(boolean)</code></a></dd></dl>
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<h4>getName</h4>
<pre>public java.lang.String getName()</pre>
<div class="block">Returns the name of the cookie. The name cannot be changed after
creation.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> specifying the cookie's name</dd></dl>
</li>
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<h4>setValue</h4>
<pre>public void setValue(java.lang.String newValue)</pre>
<div class="block">Assigns a new value to a cookie after the cookie is created.
If you use a binary value, you may want to use BASE64 encoding.
<p>With Version 0 cookies, values should not contain white
space, brackets, parentheses, equals signs, commas,
double quotes, slashes, question marks, at signs, colons,
and semicolons. Empty values may not behave the same way
on all browsers.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>newValue</code> - a <code>String</code> specifying the new value</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#getValue()"><code>getValue()</code></a>,
<a href="../../../javax/servlet/http/Cookie.html" title="class in javax.servlet.http"><code>Cookie</code></a></dd></dl>
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<h4>getValue</h4>
<pre>public java.lang.String getValue()</pre>
<div class="block">Returns the value of the cookie.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> containing the cookie's
present value</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#setValue(java.lang.String)"><code>setValue(java.lang.String)</code></a>,
<a href="../../../javax/servlet/http/Cookie.html" title="class in javax.servlet.http"><code>Cookie</code></a></dd></dl>
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<h4>getVersion</h4>
<pre>public int getVersion()</pre>
<div class="block">Returns the version of the protocol this cookie complies
with. Version 1 complies with RFC 2109,
and version 0 complies with the original
cookie specification drafted by Netscape. Cookies provided
by a browser use and identify the browser's cookie version.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>0 if the cookie complies with the
original Netscape specification; 1
if the cookie complies with RFC 2109</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#setVersion(int)"><code>setVersion(int)</code></a></dd></dl>
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<h4>setVersion</h4>
<pre>public void setVersion(int v)</pre>
<div class="block">Sets the version of the cookie protocol this cookie complies
with. Version 0 complies with the original Netscape cookie
specification. Version 1 complies with RFC 2109.
<p>Since RFC 2109 is still somewhat new, consider
version 1 as experimental; do not use it yet on production sites.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v</code> - 0 if the cookie should comply with
the original Netscape specification;
1 if the cookie should comply with RFC 2109</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/Cookie.html#getVersion()"><code>getVersion()</code></a></dd></dl>
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<h4>clone</h4>
<pre>public java.lang.Object clone()</pre>
<div class="block">Overrides the standard <code>java.lang.Object.clone</code>
method to return a copy of this cookie.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code>clone</code> in class <code>java.lang.Object</code></dd>
</dl>
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